Giant snakes, big dogs, horses, and other large animals are dangerous--although not nearly so dangerous as automobiles. Wear your seatbelt.
It sounds like you're doing just fine. The big snakes have locks on their cages, and are secure, and you're aware of their strength. By the time your juvenile RTB is large enough to pose any threat, your child will be too big to eat.
There's no reason to evict your snakes because you have a baby--any more than there would be a reason to sell your car and start walking, or give up a beloved dog. You'll have enough fears as a new parent without spending a lot of time on this one. Your child will benefit from growing up in a household where animals are respected and cared for properly, and will likely adopt an appreciation for animals and the natural world, as a result. That's a good thing. Just keep those cages locked, because toddlers get into EVERYTHING, and as noisy as they are while you are awake, they can stealth like the most skilled deer hunter while you are sleeping, and you don't want to wake up to discover that the baby has eaten the snake.